Beginners' zoology . , chalky cloud in limewater ; another is that it smothers a fire. Experiment to show that Animals give off CarbonBicxidc. — Place a cardboard over the mouth of a bottle containingpure air. Take a long straw, the hollow stem of a weed,a glass tube, or a sheet of stiff paper rolled into a tube,and pass the tube into the bottle through a hole in thecardboard. Without drawing in a deep breath, send onelong breath into the bottle through the tube, emptying thelungs by the breath as nearly as possible (Fig. 4). Next,invert the bottle on the table as in the former experiment, THE
Beginners' zoology . , chalky cloud in limewater ; another is that it smothers a fire. Experiment to show that Animals give off CarbonBicxidc. — Place a cardboard over the mouth of a bottle containingpure air. Take a long straw, the hollow stem of a weed,a glass tube, or a sheet of stiff paper rolled into a tube,and pass the tube into the bottle through a hole in thecardboard. Without drawing in a deep breath, send onelong breath into the bottle through the tube, emptying thelungs by the breath as nearly as possible (Fig. 4). Next,invert the bottle on the table as in the former experiment, THE PRINCIPLES OF BIOLOGY afterward withdrawing the cardboard. Move the bottleto the edge of the table and pass the lighted candle upinto it (Fig. 5). Does the flame go out as quickly asin the former experiment ? If you breathe through a tube into clear lime water,the water turns milky. The effect of the breath on thecandle and on the lime water shows that carbon dioxide iscontinually leaving our bodies in the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
